Rotational damper



FIG. 1 is a front view of a rotational damper showing my new design;

FIG. 2 is a right side view thereof;

FIG. 3 is a left side view thereof;

FIG. 4 is a plan view thereof;

FIG. 5 is a bottom view thereof; and,

FIG. 6 is a perspective view thereof.

The ornamental design for a rotational damper, as shown and described.